I have got RFE on my parents I-130 for Family based immigration. I have submitted 3 proper affidavits as proof of marriage from person living at that time. I have not submitted any other doc for marriage - RFE Title ( page 2) : FATHER'S PATERNITY AND LEGITIMATION To approve a relationship bet a father and a child, in addition to establishing paternity, you must also establish that the child is legitimate or has been legitimated .... 1) You must establish legitimation through the marriage of child's genetic parents. You may establish this by submitting copy of orginal marriage certificate of XXX and the childs genetic mother..... USCIS has received copy of 3 Affidavits regarding the marriage of XXX and YYY, you submitted with your petition, however additional evidence is required. ... 2) Not valid case for us My parents marriage was not registered so how to get certificate? Any help would be appreciated. Thx in advance.